#include <stdio.h>

typedef unsigned char *byte_pointer;

void show_bytes(byte_pointer start, int len)
{

		    int i;
			    for (i = 0; i < len; i++)
						printf(" %.2x", start[i]);
				    printf("\n");
}

void show_int(int x)
{

		    show_bytes((byte_pointer) &x, sizeof(int));
}

void show_float(float x)
{

		    show_bytes((byte_pointer) &x, sizeof(float));
}

void show_pointer(void *x)
{

		    show_bytes((byte_pointer) &x, sizeof(void *));
}
/* $end show-bytes */


/* $begin test-show-bytes */
void test_show_bytes(int val)
{

		    int ival = val;
			    float fval = (float) ival;
				    int *pval = &ival;
					    show_int(ival);
						    show_float(fval);
							    show_pointer(pval);
}
/* $end test-show-bytes */

void simple_show()
{

		/* $begin simple-show */
		int val = 0x12345678;
		byte_pointer valp = (byte_pointer) &val;
		show_bytes(valp, 1); /* A. */
		show_bytes(valp, 2); /* B. */
		show_bytes(valp, 3); /* C. */
		/* $end simple-show */
}

void float_eg()
{

		/* $begin float-show */
		int x = 3490593;
		float f = (float) x;
		show_int(x);
		show_float(f);
		/* $end float-show */
}

void string_eg()
{

		/* $begin show-string */
		char *s = "ABCDEF";
		show_bytes(s, strlen(s)); 
		/* $end show-string */
}

void show_twocomp() 
{

		/* $begin show-twocomp */
		    short int x = 12345; 
			    short int mx = -x; 
				    
				    show_bytes((byte_pointer) &x, sizeof(short int)); 
					    show_bytes((byte_pointer) &mx, sizeof(short int)); 
						/* $end show-twocomp */
}

int main(int argc, char *argv[])
{

		    int val = 12345;
			    if (argc > 1) {
						    if (argv[1][0] == '0' && argv[1][1] == 'x')
								  	scanf(argv[1]+2, "%x", &val);
							        else
									 scanf(argv[1], "%d", &val);
									  printf("calling test_show_bytes\n");
										        test_show_bytes(val);
												    } else {

			printf("calling show_twocomp\n");
																        
			show_twocomp();
																		      printf("Calling simple_show\n");
																			        simple_show();
																					      printf("Calling float_eg\n");
																						        float_eg();
																								      printf("Calling string_eg\n");
																									        string_eg();
																											    }
				    return 0;
}

